src/examples/cpp03/multicast/receiver.cpp | src/examples/cpp11/multicast/receiver.cpp |
⋮ | ⋮ |
1 | // | 1 | // |
2 | //·receiver.cpp | 2 | //·receiver.cpp |
3 | //·~~~~~~~~~~~~ | 3 | //·~~~~~~~~~~~~ |
4 | // | 4 | // |
5 | //·Copyright·(c)·2003-2022·Christopher·M.·Kohlhoff·(chris·at·kohlhoff·dot·com) | 5 | //·Copyright·(c)·2003-2022·Christopher·M.·Kohlhoff·(chris·at·kohlhoff·dot·com) |
6 | // | 6 | // |
7 | //·Distributed·under·the·Boost·Software·License,·Version·1.0.·(See·accompanying | 7 | //·Distributed·under·the·Boost·Software·License,·Version·1.0.·(See·accompanying |
8 | //·file·LICENSE_1_0.txt·or·copy·at·http://www.boost.org/LICENSE_1_0.txt) | 8 | //·file·LICENSE_1_0.txt·or·copy·at·http://www.boost.org/LICENSE_1_0.txt) |
9 | // | 9 | // |
10 | | 10 | |
| 11 | #include·<array> |
11 | #include·<iostream> | 12 | #include·<iostream> |
12 | #include·<string> | 13 | #include·<string> |
13 | #include·"asio.hpp" | 14 | #include·"asio.hpp" |
14 | #include·"boost/bind/bind.hpp" | |
15 | | 15 | |
16 | const·short·multicast_port·=·30001; | 16 | constexpr·short·multicast_port·=·30001; |
17 | | 17 | |
18 | class·receiver | 18 | class·receiver |
19 | { | 19 | { |
20 | public: | 20 | public: |
21 | ··receiver(asio::io_context&·io_context, | 21 | ··receiver(asio::io_context&·io_context, |
22 | ······const·asio::ip::address&·listen_address, | 22 | ······const·asio::ip::address&·listen_address, |
23 | ······const·asio::ip::address&·multicast_address) | 23 | ······const·asio::ip::address&·multicast_address) |
24 | ····:·socket_(io_context) | 24 | ····:·socket_(io_context) |
25 | ··{ | 25 | ··{ |
26 | ····//·Create·the·socket·so·that·multiple·may·be·bound·to·the·same·address. | 26 | ····//·Create·the·socket·so·that·multiple·may·be·bound·to·the·same·address. |
27 | ····asio::ip::udp::endpoint·listen_endpoint( | 27 | ····asio::ip::udp::endpoint·listen_endpoint( |
28 | ········listen_address,·multicast_port); | 28 | ········listen_address,·multicast_port); |
29 | ····socket_.open(listen_endpoint.protocol()); | 29 | ····socket_.open(listen_endpoint.protocol()); |
30 | ····socket_.set_option(asio::ip::udp::socket::reuse_address(true)); | 30 | ····socket_.set_option(asio::ip::udp::socket::reuse_address(true)); |
31 | ····socket_.bind(listen_endpoint); | 31 | ····socket_.bind(listen_endpoint); |
32 | | 32 | |
33 | ····//·Join·the·multicast·group. | 33 | ····//·Join·the·multicast·group. |
34 | ····socket_.set_option( | 34 | ····socket_.set_option( |
35 | ········asio::ip::multicast::join_group(multicast_address)); | 35 | ········asio::ip::multicast::join_group(multicast_address)); |
36 | | 36 | |
37 | ····socket_.async_receive_from( | 37 | ····do_receive(); |
38 | ········asio::buffer(data_,·max_length),·sender_endpoint_, | |
39 | ········boost::bind(&receiver::handle_receive_from,·this, | |
40 | ··········asio::placeholders::error, | |
41 | ··········asio::placeholders::bytes_transferred)); | |
42 | ··} | 38 | ··} |
43 | | 39 | |
44 | ··void·handle_receive_from(const·asio::error_code&·error, | 40 | private: |
45 | ······size_t·bytes_recvd) | 41 | ··void·do_receive() |
46 | ··{ | 42 | ··{ |
47 | ····if·(!error) | 43 | ····socket_.async_receive_from( |
48 | ····{ | 44 | ········asio::buffer(data_),·sender_endpoint_, |
49 | ······std::cout.write(data_,·bytes_recvd); | 45 | ········[this](std::error_code·ec,·std::size_t·length) |
50 | ······std::cout·<<·std::endl; | 46 | ········{ |
51 | | 47 | ··········if·(!ec) |
52 | ······socket_.async_receive_from( | 48 | ··········{ |
53 | ··········asio::buffer(data_,·max_length),·sender_endpoint_, | 49 | ············std::cout.write(data_.data(),·length); |
54 | ··········boost::bind(&receiver::handle_receive_from,·this, | 50 | ············std::cout·<<·std::endl; |
55 | ············asio::placeholders::error, | 51 | |
56 | ············asio::placeholders::bytes_transferred)); | 52 | ············do_receive(); |
57 | ····} | 53 | ··········} |
| 54 | ········}); |
58 | ··} | 55 | ··} |
59 | | 56 | |
60 | private: | |
61 | ··asio::ip::udp::socket·socket_; | 57 | ··asio::ip::udp::socket·socket_; |
62 | ··asio::ip::udp::endpoint·sender_endpoint_; | 58 | ··asio::ip::udp::endpoint·sender_endpoint_; |
63 | ··enum·{·max_length·=·1024·}; | 59 | ··std::array<char,·1024>·data_; |
64 | ··char·data_[max_length]; | |
65 | }; | 60 | }; |
66 | | 61 | |
67 | int·main(int·argc,·char*·argv[]) | 62 | int·main(int·argc,·char*·argv[]) |
68 | { | 63 | { |
69 | ··try | 64 | ··try |
70 | ··{ | 65 | ··{ |
71 | ····if·(argc·!=·3) | 66 | ····if·(argc·!=·3) |
72 | ····{ | 67 | ····{ |
73 | ······std::cerr·<<·"Usage:·receiver·<listen_address>·<multicast_address>\n"; | 68 | ······std::cerr·<<·"Usage:·receiver·<listen_address>·<multicast_address>\n"; |
74 | ······std::cerr·<<·"··For·IPv4,·try:\n"; | 69 | ······std::cerr·<<·"··For·IPv4,·try:\n"; |
75 | ······std::cerr·<<·"····receiver·0.0.0.0·239.255.0.1\n"; | 70 | ······std::cerr·<<·"····receiver·0.0.0.0·239.255.0.1\n"; |
76 | ······std::cerr·<<·"··For·IPv6,·try:\n"; | 71 | ······std::cerr·<<·"··For·IPv6,·try:\n"; |
77 | ······std::cerr·<<·"····receiver·0::0·ff31::8000:1234\n"; | 72 | ······std::cerr·<<·"····receiver·0::0·ff31::8000:1234\n"; |
78 | ······return·1; | 73 | ······return·1; |
79 | ····} | 74 | ····} |
80 | | 75 | |
81 | ····asio::io_context·io_context; | 76 | ····asio::io_context·io_context; |
82 | ····receiver·r(io_context, | 77 | ····receiver·r(io_context, |
83 | ········asio::ip::make_address(argv[1]), | 78 | ········asio::ip::make_address(argv[1]), |
84 | ········asio::ip::make_address(argv[2])); | 79 | ········asio::ip::make_address(argv[2])); |
85 | ····io_context.run(); | 80 | ····io_context.run(); |
86 | ··} | 81 | ··} |
87 | ··catch·(std::exception&·e) | 82 | ··catch·(std::exception&·e) |
88 | ··{ | 83 | ··{ |
89 | ····std::cerr·<<·"Exception:·"·<<·e.what()·<<·"\n"; | 84 | ····std::cerr·<<·"Exception:·"·<<·e.what()·<<·"\n"; |
90 | ··} | 85 | ··} |
91 | | 86 | |
92 | ··return·0; | 87 | ··return·0; |
93 | } | 88 | } |